public class ceshi3_4 {
	public static void main(String args[]) {
		long []a = {1,2,3,4};
		long []b = {100,200,300,400,500};
		b = a;
		System.out.println("数组b的长du:"+b.length);
		System.out.println("b[0]="+b[0]);
	}
}
